Rotation and feed regulator



May 25 1926..

L. C. BAYLES ET AL ROTATION AND FEED REGULATOR Filed Dec. 30, 1922 ledPatented May 25, 192

LEWIS C. BAYLES AND FRED M. SLATER, OF EASTGN, FENIISYLVAITIA, ASSIGNORST INGERSOLL-RAND COMPANY, (3F CITY, NEW JEE$EY, A CORPORA- TION OF NEWJERSEY.

ROTATION AND FEED REGULATOR.

Application filed December This invention relates to fluid actuated rockdrills of the hammer type, but more particularly to a machine of thistype having automatic rotation, as for instance, rifle 5 bar rotationfor the drill steel, and a fluid actuated feeding, element for feedingthe machine forward.

The objects of the invention are to enable the air feeding element to hecontrolled and permit light air feed tobe used on starting a hole, whileat the same time permitting the rotation to be stopped altogether.

Another object of the invention is to enable the feeding and rotationcontrolling mechanism to be controlled by a hand rotated device, so thatthe machine may be used without the possibility of operation of thecontrolling mechanism when desired.

Further objects of the invention will hereinafter appear and to all ofthese ends the invention is shown in the accompanying drawings, in oneof its preferred forms, in which- Figure 1 is a side elevation inlongitudinal section of a stope drill, on the line 1-1 of Figure 2,looking in the direction of the arrows, and embodying; the invention,

Figure 2 is a horizontal sectional view on the line 22 of Figure 1looking in the direction oi": the arrows with the parts in lockedposition,

Figure 8 is a View similar to Figure 2 with the parts released, and

Figure 4 is a horizontal sectional view of Figure 2 on the line 4+4looking in the direction of the arrows.

Referring to the drawings, the machine comprises the cylinder A having areciproeating; piston B adapted to impartblows of impact to the drillsteel C, which extends into the front head D and rotating chuck E, inposition to receive the blows of impact of the hammer piston. The pistonis provided with a forward fluted extension E passing through the frontcylinder washer F and engaging flutes G on the chuck 11 The rearwardextension H of the piston enrages the usual rifle bar J provided withthe usual ratchet and pawl mechanism for causing rotation. The rifle barhead K is provided with the spring pressed pawls Ii adapted to engagethe ratchet ring O located in the back. cylinder extension P.

The head block Q carries the throttle valve R controlling the supply ofmotive fluid to the percussive element and to the air feeding element ofthe machine through the inlet S. Without describing the course anddistribution of the motive fluid to the cylinder and piston, it will besutiicient to state that as the piston reciprocates under the action ofmotive fluid, rotation will be imparted to the steel.

The air feed cylinder T is provided with the piston U having the pistonrod V and a pivoted foot piece W at tie lower end of the piston rod isformed with the rock engaging points X. The cylinder T is in slidablebut non-rotatable engagement with the pistonrod V, due to theprojections Y on the cylinder engaging grooves Z in the piston rod. Thepercussive element and the air feeding; element of the machine are heldtogether by the usual side rods a.

Motive fluid is constantly supplied to the air feed cylinder from thethrottle B through the port Z) and a relief port 0 leads from the airfeed. cylinder to the valve chamber (Z of the valve 6, which controlscommunication between the relief port 0 and the atmospheic vent f.

The ratchet ring 0 of the rotation mechanism is in this instanceprovided with a finger 5 adapted to bear upon the head h of the valve 6,and a spring 7' is shown compressed bct-ween the valve 0 and the cap is,in which cap vent 0 is placed. The spring j is of insutiicient strengthto resist the tendency of the ratchet ring 0 to rotate when the machineis running, so that when the valve c is released and permitted to movein the valve chamber 6!, the rotation for the machine becomes sliprotation, or else the rotation is stopped altogether, and the piston .limerely reciprocates without rotating, due to the fact that the ratchetring 0 is not held tightly in the head block P.

A stop, in the form of a pin 22, is mounted at the side of the valve eand provided with a spring q adapted to be compressed between the collar1 on the stop pin and the plug .9 surrounding; the stem of the pin. Thepin p is provided with a projection 2? which is adapted to slide in theslot 24 in the cap or plug a so that the stop pin, which controlled bythe handle or finger piece '2) may be moved inwardly into the path ofthe relief valve 0 beneath the head it as indicated in Figure 2, inorder to lock the valve from movement or else the stop pin p may bewithdrawn and rotated to permitthe projection t to lie upon element tooperate as required without rotating the drill steel and with light airfeed in the air teed cylinder. If strong rotation is permitted, undersuch circumstances, difficulty is experienced in collaring the hole.pulling out the stop pin 29 to the position indicated in Figure 3, the

abutment afforded by the head h of the relief valve 0 against the lingervg of the ratchet ring 0 is released, and the ratchet ring '0 is free tomove back and forth as the piston B reciprocates, so that the rot-ationis not imparted to the drill steel. At

the same time, the vent in the air teed cylinder is open through thepassage 0 and atmospheric vent f, or is opened and closed intermittentlyas the finger g of the ratchet ring 0 presses the relief valve back andforth under the influence of the spring 7', In order to again apply the"full force of the air feed and restore the full rotation, the

stop pin 39 is again moved inwardly to catch under the head 7a of therelief valve 0 to lock the valve from movement, as indiated in Figure 2.

e claim:

In a fluid actuated rock drill of the hammer type, the combination 0trifle bar rotation "for the drill steel having a releasable ratchet ringadapted to be moved by resistance to rotation when released, means forfeeding the machine forward, said means being fluid, a stop on theratchet ring, a valve controlling the feeding means mounted ad- "acentthe ratchet rin and ada )ted to be t3 actuated by said step, a springtending to force said valve to closed position insuilicient strength toresist rotation oi the ratchet ring, a spring pressed valre stop topositively engage the valve for normally holding the valve and theratchet ring immovable, ad a finger piece on the stop whereby d stop maybe withdrawn to release the valve and the ratchet ring for permittingtree oscillation of the ratchet ring and reciprocation ot the valve andto permit a portion of pressure fluid to be intermittently released fromthe feeding means by the valve.

FRED M. SLAYER.

constantly exposed to pressure

